Delete superfluous comment
Merge branch 'master' of github.com:dnsmkl/dlex
Rename makeSeqOnlyIfNeeded()->singleNode()

Also: make it template, so later it could be also usable with ast.Or
Also: comment the function
Refactor how paranthesis are handled

Make 'Paranthesis' a template parameter
Remove tmp variable 'c' and rename currentChar

'c' held current character, bu could not be always used, because of index manipulations.
'currentChar' was actualy index of current character, so rename it to currentIndex.